Question

这个问题让我疯狂了一个星期了。我一直在寻找解决方案，但找不到它。我已经尝试开始新项目并且它一直在发生在我身上。我不认为我的代码错误。我认为这与我的Eclipse配置有关。

我使用的是JDK1.8，最新的Eclipse IDE和tomcat 8.5。如果有人可以帮助我解决这个问题，那么你们将会整整一周。

请帮我弄清楚问题......请！

我会尝试尽可能地保持干净，因为我需要帮助很严重。

这是我的目录树：

Directories Tree

首先，这是我的pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.tutorialspoint</groupId>
  <artifactId>HelloWeb</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>HelloWeb Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
        <version>3.2.18.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-beans</artifactId>
        <version>3.2.18.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>3.2.18.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
        <version>3.2.18.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>3.2.18.RELEASE</version>
    </dependency>
  </dependencies>
  <build>
    <finalName>HelloWeb</finalName>
  </build>
</project>

这是我的web.xml

    <!DOCTYPE web-app PUBLIC
     "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
     "http://java.sun.com/dtd/web-app_2_3.dtd" >

    <web-app>
      <display-name>Archetype Created Web Application</display-name>
      <servlet>
          <servlet-name>HelloWeb</servlet-name>
          <servlet-class>
             org.springframework.web.servlet.DispatcherServlet
          </servlet-class>
          <load-on-startup>1</load-on-startup>
       </servlet>

       <servlet-mapping>
          <servlet-name>HelloWeb</servlet-name>
          <url-pattern>/</url-pattern>
       </servlet-mapping>
    </web-app>


This is my Servlet 'HelloWeb-servlet.xml'
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd">


    <context:component-scan
        base-package="com.tutorialspoint">
    </context:component-scan>
    <bean
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix" value="/WEB-INF/jsp/"></property>
    <property name="suffix" value=".jsp"></property>
    </bean>
    <context:annotation-config></context:annotation-config>
</beans>

我的控制器＆＃39; HelloController＆＃39;

package com.tutorialspoint;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.ui.ModelMap;

@Controller
@RequestMapping("/hello")
public class HelloController {
    @RequestMapping(method = RequestMethod.GET)
    public String printHello(ModelMap model) {
        model.addAttribute("message", "Hello Spring MVC Framework!");
        return "hello";
    }

}

最后，我的jsp＆＃39; hello.jsp＆＃39;

<%@ page contentType = "text/html; charset = UTF-8" %>
<html>
   <head>
      <title>Hello World</title>
   </head>

   <body>
      <h2>${message}</h2>
   </body>
</html>

这是控制台输出和一些警告代码：

Apr 11, 2018 11:09:32 PM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.j2ee.server:HelloWeb' did not find a matching property.
Apr 11, 2018 11:09:32 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Server version:        Apache Tomcat/8.5.29
Apr 11, 2018 11:09:32 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Server built:          Mar 5 2018 13:11:12 UTC
Apr 11, 2018 11:09:32 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Server number:         8.5.29.0
Apr 11, 2018 11:09:32 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: OS Name:               Mac OS X
Apr 11, 2018 11:09:32 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: OS Version:            10.13.4
Apr 11, 2018 11:09:32 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Architecture:          x86_64
Apr 11, 2018 11:09:32 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Java Home:             /Library/Java/JavaVirtualMachines/jdk1.8.0_161.jdk/Contents/Home/jre
Apr 11, 2018 11:09:32 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: JVM Version:           1.8.0_161-b12
Apr 11, 2018 11:09:32 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: JVM Vendor:            Oracle Corporation
Apr 11, 2018 11:09:32 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: CATALINA_BASE:         /Users/boss/Documents/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0
Apr 11, 2018 11:09:32 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: CATALINA_HOME:         /Users/boss/Documents/apache-tomcat-8.5.29
Apr 11, 2018 11:09:32 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dcatalina.base=/Users/boss/Documents/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0
Apr 11, 2018 11:09:32 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dcatalina.home=/Users/boss/Documents/apache-tomcat-8.5.29
Apr 11, 2018 11:09:32 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dwtp.deploy=/Users/boss/Documents/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps
Apr 11, 2018 11:09:32 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Djava.endorsed.dirs=/Users/boss/Documents/apache-tomcat-8.5.29/endorsed
Apr 11, 2018 11:09:32 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dfile.encoding=UTF-8
Apr 11, 2018 11:09:32 PM org.apache.catalina.core.AprLifecycleListener lifecycleEvent
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [/Users/boss/Library/Java/Extensions:/Library/Java/Extensions:/Network/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java:.]
Apr 11, 2018 11:09:33 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-nio-8080"]
Apr 11, 2018 11:09:33 PM org.apache.tomcat.util.net.NioSelectorPool getSharedSelector
INFO: Using a shared selector for servlet write/read
Apr 11, 2018 11:09:33 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-nio-8009"]
Apr 11, 2018 11:09:33 PM org.apache.tomcat.util.net.NioSelectorPool getSharedSelector
INFO: Using a shared selector for servlet write/read
Apr 11, 2018 11:09:33 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 532 ms
Apr 11, 2018 11:09:33 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service [Catalina]
Apr 11, 2018 11:09:33 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/8.5.29
Apr 11, 2018 11:09:35 PM org.apache.jasper.servlet.TldScanner scanJars
INFO: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
Apr 11, 2018 11:09:37 PM org.apache.jasper.servlet.TldScanner scanJars
INFO: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
Apr 11, 2018 11:09:37 PM org.apache.catalina.core.ApplicationContext log
INFO: No Spring WebApplicationInitializer types detected on classpath
Apr 11, 2018 11:09:37 PM org.apache.catalina.core.ApplicationContext log
INFO: Initializing Spring FrameworkServlet 'HelloWeb'
Apr 11, 2018 11:09:37 PM org.springframework.web.servlet.DispatcherServlet initServletBean
INFO: FrameworkServlet 'HelloWeb': initialization started
Apr 11, 2018 11:09:37 PM org.springframework.web.context.support.XmlWebApplicationContext prepareRefresh
INFO: Refreshing WebApplicationContext for namespace 'HelloWeb-servlet': startup date [Wed Apr 11 23:09:37 PDT 2018]; root of context hierarchy
Apr 11, 2018 11:09:37 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from ServletContext resource [/WEB-INF/HelloWeb-servlet.xml]
Apr 11, 2018 11:09:37 PM org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@7bb8b4fb: defining beans [org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,org.springframework.web.servlet.view.InternalResourceViewResolver#0,org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor]; root of factory hierarchy
Apr 11, 2018 11:09:37 PM org.springframework.web.servlet.DispatcherServlet initServletBean
INFO: FrameworkServlet 'HelloWeb': initialization completed in 571 ms
Apr 11, 2018 11:09:37 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-nio-8080"]
Apr 11, 2018 11:09:37 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-nio-8009"]
Apr 11, 2018 11:09:37 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 4879 ms
Apr 11, 2018 11:09:38 PM org.springframework.web.servlet.PageNotFound noHandlerFound
WARNING: No mapping found for HTTP request with URI [/HelloWeb/] in DispatcherServlet with name 'HelloWeb'

编辑：

我已经在@RequestMapping上对我的HelloController.java进行了编辑，从/ hello到/

代码仍无效。

package com.tutorialspoint;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.ui.ModelMap;

@Controller
@RequestMapping("/")
public class HelloController {
    @RequestMapping(method = RequestMethod.GET)
    public String printHello(ModelMap model) {
        model.addAttribute("message", "Hello Spring MVC Framework!");
        return "hello";
    }

}

Answer 1

我没有测试它，但您可以尝试将以下内容添加到您的web.xml文件中。

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/HelloWeb-servlet.xml</param-value>
</context-param>

<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

此外，根据您的控制器，路径将是/ HelloWeb / hello

Answer 2

您正在为Tomcat 5，Servlet 2.3定义web.xml。尝试切换到更新版本，至少2.5，使用XSD而不是DTD

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

另外，不要忘记在XML配置中声明<mvc:annotation-driven />成员。

总的来说，也许最好开始使用更新的Spring MVC教程，因为你使用的Spring版本（3.2）是在7年前发布的？

Answer 3

我已经完成了两件事，并且在我身边工作得很好。

首先，在 HelloWeb-servlet.xml

中添加<mvc:annotation-driven/>

然后，使用以下代码在 hello.jsp 中启用EL expression：

<%@ page language="java" contentType="text/html; charset=UTF-8"%>
<%@ page isELIgnored="false" %><!-- add this line to enable ex expression -->

执行此操作后，它可以在我身边运行成功，运行结果如下：

如果它仍无法在你身边工作，你需要清理并重建它，或者再次重新开始它。

我已将源代码上传到 Google Drive ，您可以根据需要进行检查（请注意项目名称为 utest ，但构建路径为 /的HelloWeb ）

为什么我在启动webmvc项目时总是这样做？找不到HTTP请求的映射？

3 个答案: